Olly Murs, Nathan Sykes and Jason Isaacs are among a host of stars backing Daffodil Day.
The famous faces have shared their memories of loved ones in honour of Marie Curie's Great Daffodil Appeal, which encourages people to donate and wear the yellow flower on March 31.
Olly said: "On the 31st March, I'll be wearing my Marie Curie Daffodil and remembering my best friend, who lost his mum to cancer a few years ago."
Former The Wanted singer Nathan praised his young cousin as he backed the appeal.
He said: "I'm wearing a daffodil for my little cousin Jess, who is the strongest person I know."
And 'Harry Potter' actor Jason spoke about his mother, who passed away in 2014.
He said: "I'm very proudly remembering my mum, who loved me, but was always unimpressed by my acting."
Other stars backing the campaign also include actress Alison Steadman and presenter Amanda Lamb.
Alison said: "[I wear a daffodil] In memory of my dear mum, who was so supportive and always helped me."
And Amanda added: "I'll be remembering my grandad, who was the most amazing grandad."
Presenters Dave Berry and Vanessa Feltz, 'Good Morning Britain's Laura Tobin, 'Little Voice' star Jane Horrocks, soprano Laura Wright, swimmer Duncan Goodhew, soccer pundit Chris Kamara and comedy duo the Chuckle Brothers are also lending their support to Daffodil Day.
The Great Daffodil Appeal is Marie Curie's biggest annual fundraising campaign, taking place throughout March and culminating in Daffodil Day at the end of the month.
Funds raised will help Marie Curie Nurses care for people living with a terminal illness in their own homes and the charity's hospices For more information on how to donate, visit www.mariecurie.org.uk/daffodil or call 0800 304 7025.
To see the celebrity video backing the campaign, visit https://vimeo.com/210402492